Brush-holder



H. G. JUNGK.

BRUSH HOLDER. APPLICATION FILED OCT. 8, 1912.

1,362,007, Patented Dec. 14, 1920 WITNESSES: INVENTOR Z4 I fie/barf 6. Jung/f L T r UNITED STATES PATEN'i" FFIQE,

HERBERT G. JUNGK, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPAN A COREORATION OF PENNSYLVANIA.

BRUSH-HOLDER.

Application filed October 8, 1917.

To all whom it may concern:

Be it known that I, HERBERT G. J UNGK, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a n w and useful improvement in Brushr elders, of which the following is a specification.

My invention relates to brush-holders for dynamo-electric machines, and it has for its object to provide a brush-holder which shall be so constructed that it cannot move, with respect to the dynamo electric machine frame, after it has been installed therein.

Heretofore, it has been customary, in brush-holder construction, to make the pin, by which the brush-holder body is attached to the frame of the dynamo-electric machine, smooth and cylindrical throughout that portion of its length which is embedded in the brush-holder body. The objection to this construction is that the brush-holder body may work loose on the pin, fall upon th collecting surface and become entangled with the moving parts, thereby causing damage to either the moving parts or the brushholder itself. Another objection to this construction is that the brush holder may turn about the pin as an axis to establish a ground througl'i the frame or a short circuit through adjacent holders.

in the accompanying drawing, Figure 1 is a sectional view of a brush-holder embodying my invention and Fig. 2 is a detail view of the pin shown in Fig. 1.

As shown in the drawing,the brush-holder body 1 supports a brush 2 and is, in turn, supported by a portion 3 of the dynamoelectric machine frame by means of a pin a. The pin 4%. is attached, at one end 5, to the portion 3 of the dynamo-electric machine frame, by means of a bolt 6, and a nut 7. The other end of the pin 4 is embedded in a tapered hole 9 in the brush-holder body 1, by means of which the brush-holder is supported. On account of the pin 4:, and also the hole 9 into which it fits, being tapered, the brush-holder body is prevented from moving toward the current-collecting surface, and it is also prevented from moving toward the support 3 by a disk 10 which is inserted in the large end of the hole 9, after the pin 4 has been placed therein, the ma- Specification of Letters Patent.

Patented Dec. 14:, 1920.

Serial No. 195,297.

terial surrounding the larger end of the hole 9 is then upset inwardly to retain the disk 10 in position.

'lhe pin is insulated. from the brushiolder body 1 by means of a tapered tube 11 of insulating material and is also insulated from the nietallic disk 10 by means of insulating disl s 12, which are inserted therebetween. The pin at is longitudinally knurled at its larger end, as shown at 8, to prevent the brush-holder body from turning about the pin as an axis.

While 1 have shown one form of my invention, and described one application of the same, it will be obvious to those skilled in the art that is not so limited but is susceptible of various minor changes and modifications without departing from the spirit thereof, and E desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or are speciiically set forth in the appended claims.

1 claim my invention:

" manic-electric machine, a brush- ;ising a support, a brush-holder A ed with a tapered opening theresupporting pin having a tapered end 1011, a part of which is disposed within tapered opening but is insulated from brush holder body and having a flatned end moulltec in said brush-holder suport, a d an annular insulating gmember iounted on the tapered portion of said pin intermediate said brush-holder body and said support.

In combination, a brush-holder comprisin support, a brush-holder body prodded ith a tapered opening therein, a supporting pin provided with a tapered knurled portion disposed within said tapered opening, a tube of insulating material disposed intermediate said pin and the walls of said opening, and plurality of disks of insulating material disposed in the larger end of said opening in engagement with the end of said pin, the edges of the opening in the brush-holder body being inturned to position said disks and said pin.

In testimony whereof, I have hereunto subscribed my name this 22nd day of Sept. 1910 53P cl- (1) m 

